Furnace



Aplfil 30, 1929. HARTER 1,711,147

FURNACE Filed May 26, 1925 2 Sheets-Sheet 1 IN VEN TOR f A TTORNEYS April 30, 1929. 1 1 ER 1,711,147

FFFFF CE Patented Apr. 30, 1929.

UNITED STATES 1,111,141 PATENT OFFICE.

ISAAC innrun, or nonean urns, miw YORK, assrenon,

BY MESN E ASSIGN HEN 1'8,

'10 FULLER LEHIGH OOMPANY, A, CORPORATION OF DELAWARE.

FURNACE.

Application filed la at,

My present invention relates to furnaces, particularly when such furnaces are provided with air-cooling ducts formed between a pair of parallel walls spaced a art, and will 19 larged view of a portion of Fig. 1, and Fig. 3

1s a plan view of the parts shown inFig. 2.

Like reference characters indicate like parts throughout the drawings.

For purposes of illustration, I have cho I a typical form of combustion chamber, suc

as 1s commonly used with a steam boiler, in which the fuel is powdered coal. drawings, the combustion chamber 10 has a steam boiler 11 positioned above it, the fuel being projected downward into the combustion'chamber 10 by a burner '12. The walls are provided with horizontal air ducts leading to 0 enings 13 in the front wall by which the com ustionair is supplied to the fuel, the air being forced into these ducts by a fan 14 through a main duct 15 and'a plurality of lateral ducts 16. The horizontalair ducts extend through the rear and side walls and into a chamber in the front wall'in a well-known manner, the air flowing from the ducts 16 into these horizontal ducts and from thence around the walls into the openings 13.

In the arrangement illustrated, the rear and side walls have the same general construc- 5 tion, and a description of the rear wall only will be sufiicient to make anunderstandin of my invention: complete. The rear' we. is made up of a pair of vertical parallel walls 17 18, spaced apart. It will be understood 4 thatthe walls 17' and 18 may be inclined and that by the term vertically disposed as used in the appended claims, I mean either a wall which is vertical, as shown in the drawings, or

somewhat inclined to the vertical to form a hopper-shaped furnace chamber.

In the construction of such double walls, there is no difliculty by the use of known methods in maintaining the outer wall 18 against'bulging inward or outward when sub-1 l0 jected to variations in heating; B reason of the position of the inner wall 17, owever, the maintenance of this inner wall is difiicult.

In the illustrative arrangement, I have pro vided a plurality of courses of special brick ll 18, I), each of which has a shallow recess Inthe 192's. Serial No. 82,897.

formed on a horizontal face near one end of the brick, this shallow recess merging into a deeper recess toward the middle of the brick.- When the two brick 19 and 20 are placed together, as shown best in Fig. 2, these recesses form a T-shaped recess between the brick. The brick in the walls 17 and 18 are laid so that the courses of special brick 19, 20 come approximately opposite each other.

Extending between, the walls 17 and 18 across the space between such walls I provide a plurahty of flexible metallic members to on gage the above referred to recesses, so as to maintain the walls 17 and 18 in spaced relation. In the form illustrated, these flexible 7 metallic members are shown as thin metallic plates 21, each havin an enlarged head 22 on its opposlte edges. fn each of the horizontal grooves or recesses formed in the walls 17 and 18, I preferably provide a, plurality of these plates 21 ed e to edge to serve not only as holding mem rs, but also as means for dividmg the space between the walls 17 and 18 into a plurahty of horizontal air ducts. Preferably, the plates 21 are normally spaced apart somewhat and the space between such plates ma conveniently covered by a coverplate- 23 ylng over such space and" held against disarran ement bypins 24 projecting into the s ace etween the plates 21, 21. As many of 35 t 1e cover plates 23 as may be necessary are rovided and, if desired, one can be provided etween each pair of plates 21.

It will be obvious from the arrangement just described'that v the walls 17 and 18 or any portion thereof may move both laterally and longitudinally in relation to each other while, at the sametime, the members 21 prevent the wall 17 from bulging 'inrelation to the'wall 18, so that, if the latter is held against bul ng, then the wall 17 will be correspondmg y held. The vertical motion between the walls is 1permitted by the flexing of the plates 21 and t e horizontal motion by the slidmg of these plates and their heads 22 in the grooves which I provide in the special brick 19 and 20.

It wil be understood that the arrangement which I have shown is merely illustrative and need be only relatively narrow, It will also no Y the metallic members will be maintained in spiteof the fact that they are connected to a highly heated wall, because of an air space around them through which the relatively cool combustion air is flowing. It will also be understood that as many courses of the special brick 19, 20 may be used, as desired, the remainder of thewall being made up of the refractories usually used for that purpose.

I claim:

1. A furnace havin a pair of parallel, vertically-dis osed wa ls spaced apart, and flexible meta lic plates placed substantially edge to edge and connected to the walls and extending across the space between them to hold said walls in alinement.

2. A furnace having a pair of parallel, vertically-disposed walls spaced apart, and flex-- ible metallic members connected to the walls and extending across the space between them to hold said walls in alinement, said members having a head at each end engaging grooves in the walls, the grooves being longer than the heads, whereby one wall may shift relatively to the other in the direction of the grooves and also at right-angles to the direction of the grooves by the flexing of said members.

3. A furnace having a pair of parallel, vertically-dispgsed walls spaced apart, and flexible metallic members connected to the walls and extending across the space between them to hold said walls in alinement, said members comprising thin metallic plates placed substantiall edge to edge and spaced apart to form air nets in the space between saidwalls.

4. A furnace having a pair of parallel, vertically-disposed walls spaced apart, and flexible metallic members connected to the walls and extending across the space between them to hold said walls in'alinement, said members comprising thin metallic plates spaced apart to .form air ducts in the space between said walls and each member having a head on each edge engaging a groove in one of the walls, the grooves being longe r than the heads, whereby one wall may shift relatively to the other in the direction of the grooves and also at ri lit-angles to the direction of the grooves y the flexing of said members.

5. A furnace having, a pair of parallel,

having1 pair of opposite grooves in the wall and having a head on each edge engaging the enlarged space of the groove with said head shorter than the groove with which it engages.

6. A furnace having a pair of parallel, vertically-disposed walls spaced apart, each of said walls ,having a plurality of horizontal grooves in its face adjacent the other wall, said grooves having an enlarged space at its end away from the other wall, a plurality of thin metallic members spaced along each groove, each memberv extending into a pair of opposite grooves in the wall and having a head on each edge engaging the enlarged space of the groove, the members in each groove being spaced apart and cover pieces, each extending over aspace between a pair of said members whereby a series of air ducts is formed in the space between said walls.

7 A furnace. having a pair of parallel, vertically-disposed walls spaced apart, each wall having a plurality of courses of special brick spaced apart, each of said special brick having a sh'allowrecess in its horizontal face at the end adjacent the space between the walls and a deeper recess at the inner end of said shallow-recess, and said special brick being laid in coursesto brin the recesses of adjacent courses together to orm a T-shaped recess extendin into the wall. from the ,s ace between the walls, and thin metallic mem rs havin T-shaped heads on each edge, each of sai heads engaging a T-shaped recess in one of the walls and being shorter than the recess with which it engages and said members extending across the space between the walls.

8. A furnace having a pair of parallel, vertically-disposed walls spaced apart, each wall having a plurality of courses of special brick spaced apart, each of said special brick having a shallow recess in its horizontal face at the end adjacent the space between the walls and a deeper recess at the inner end of said shallow recess, and said special brick being laid in courses to brin the recesses of adjacent courses together to orm a T-shaped recess extending into the wall from the s ace between the walls, and thin metallic mem ers T-shaped heads on e ch edge, each of sai heads engaging a T-s iaped recess in one of the walls and being shorter than the recess with which it engages and said mem- V bers extending across the space between the walls, said members being relativel wide and dividin the space between sai wall: into a plurality of parallel air ducts.

9. A furnace having a pair of parallel, vertically-disposed walls spaced apart, each wall having a plurality of courses of special brick spaced apart, each of, said special brick having a shallow recess in its horizontal face at the end adjacent the space between the walls and a deeper recess at the inner end of said shallow recess, and said especial brick being laid in courses to brin the recesses of adjacent courses together to form a T-shaped recess extending into the wall from the space between the walls, thin metallic members having T-shaped heads on each edge, each of said heads engaging a T-shaped recess in one of the walls and being shorter than the recess with which it engages and said members extending across the space between the walls, said members being relatively wide with their edges spaced apart, and a cover piece over the space between each pair of said members.

10. A furnace having a vertically-disposed wall, a fixed structure outside said wall and spaced therefrom, and flexible metallic members connected to the wall and to said fixed structure, said members being arranged to bend easily in one direction and to slide relatively a, to said wall and said structure in another direction, whereby the wall is free to move in any direction in the plane of its face and is held against motion at rightangles to such plane. 1

11. A furnace having a pair of parallel, vertically disposed walls spaced apart, flexible metallic members connected to the walls and extending across the space between them to hold said walls in alinement, said members comprising thin metallic plates spaced apart to form air ducts in the s ace between said walls, the adjacent edges 0 said plates being spaced apart, and cover plates disposed over said spaces.

ISAAC HARTER. 

